Patient Profiles
There were 67 males and 92 females. Their mean age was 15.7±17.2(range 0.3-59) years and median body weight was 31.5±25.1 (range 3.4-85) kg. According to the morphologic type of UCSS classified as Kirklin and Barratt-Boyes reported[2]: type I (completely unroofed with LSVC, Fig 1A ) 76 cases; type II (completely unroofed without LSVC) 24 cases; type III (partially unroofed midportion) 34 cases; type IV (partially unroofed terminal portion) 25 cases. Preoperative transthoracic echocardiography (TTE) were performed in all cases, and 91 cases of all patients were confirmed by TTE preoperatively, while the remaining 6 patients diagnosed before operation were found by CT scan. Among the 97 cases, 46 cases were type I, 16 were type Ⅱ, 21 were type III, 14 were type Ⅳ. The remaining 62 cases were diagnosed by intraoperative exploration. Preoperative TTE confirmed 71 cases of LSVC (53 cases of type I, 14 cases of type III, 4 cases of type IV), and 29 cases of LSVC were found by intraoperative exploration. The clinical classification and associated cardiac malformations in 159 patients with UCSS are shown in Table 1.